Sleeper



June 23, 1931. J. KUMAMOTO 1,811,016'

SLEEPER Filed April 14I 1930 Fig. 5,

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Patented June 23, 1931 KUNH-,ED Astarr-Es `Jin-1on1 KUMAMOTQ' or K'ioKYo, JArAN p SLEEP'IAER Application le.` April 14, 1930, Serial No;` 444,224, and)` in Japan `Mayk3,'1929. Y

. )This invention relates to improvements in sleepers for railway track,'especially the railwa sleepers made of concrete.

ccording to this invention, the 'sleeperis 5 provided with a bed plate'embedded infthe body of concrete. The bed plate hasia hollow spacefopened upwardly, over the banksY of which is bridged a resilient Hoor plate to re- Y cei've the .rail thereon. The floor plate has thereunder affreeclearance space and is, -supportedat its :endsin such a manner that 1t -can bend freely as a"free-end-bearn.whenpthe load imposed thereon fluctuates. `In this wise, a sucient elasticity to absorb shocks Aand vibrations unavoidable in railway track 'is imparted to the rigidstructure consisting "The holding plate, by means of which the railiis -pressed on to thefloor plate,-rests on one hand' on the Yupper inclined surface' of the rail flange and on theother hand on the longitudinal edge formed" on the bed plate,

the' upper surface ofthe ksaid edge being inclined in the opposite f sense f with respect' to they said'uppers'urface of the rail v'iange VThe holding plate, in this manner, resting ion two oppositely inclined surfaces,"is effectively` preventedffro'm slipping outwardly due to fvibra-tions. --Thev bolt, rwhich 4is of=tT-fo`rm and which clamps the holdingplate onto thel rail "iange,-' is inserted: into a-"calvity thebolt which would pull it outvfrom' the bed xformed in thebed plate 'and is caused'to abut, fat its head,'with a shoulder for-medin thecav-l fity, :and isy thus prevented from-being dislocated.

- Owing tothe fact that no direct mechani- Ycalfconnection exists between the bolt and the resilient flo-or plate, the latter lis free to 'bend 'in' responseY to the lfluctuations of the load plate, lwher'efrorn follows the ffact that Ano damage will .be caused to the concrete body at the portion where thejbed'platecomes in con- .t'act with l'the concrete body. "Inthis wise, an intiinatecontact between the two is lalways g preserved.

A igauge adjuster 1 provided around the l bolt is substantiallyof a--polygonal shape possessing' the sides, the fradialf distance e of ,l nthe acompanyhgdrawngs,": Figurenlis a vertical section Vtaken the line I-I of Figure2.

Figure 2 is a plan of the. sleeper in accor-d'- ance with vthe invention, some ofthe parts beingremovedandZ-some of them bei-ng broken Figurer 3 is a plan view ofv thev lloorfplate.4

Figure 4 is a plan .View oftheggaugead- Y juster. f- Y .i L

A Figure 5 isa cross sectional viewthereof.

' Figure 6 is a side view ofthe bolt.

- Figure 7 is a front view thereof.v Y V Referring more particularly tothe-numerals and characters ofthe drawings,f-1isthe body of the sleeper made ofconcrete andreinforced as by metallicswires 2 of anyA-suitable lconstructionand arrangement. Y Within the concrete body lfisembeddedabedplate 3 'which is provided centrally thereof 'with fa `hollow spacel. VOver' the hollow space and bridging. the two shoulders 5, 5 isa resilient floor'plate 6.. The'flo'or vplateis `provided with two notches 7, 7 tov allow-afree passage of the boltsl 8, 8.,.; Around theN'respective .bolts 8 are' provided gauge -adjusters 9j, 9 `substantially of polygonal shape whosesides are of gradually increasing` distances` from the center ofthe axial bore 10. This eccentric .polygonal piece 9,' which is disposed so as to be free from contact eitherrwith the floor plate 6 Vor with the holdingrplate `14,- abuts-at an' inclined lateral wall 11 thereof with `the -in-y l clinedfoot of the liange-of-theraillZ. The

gauge adjuster 9 rests Lat, the-opposite side on the/projecting edge lformedon the" 'bed 'Pl-abe 2, 14S ,s-the hold-ingplateengagngoni i in the opposite sense with respect to the said rail flange.

In assembling, the bolt 8 is passed through Vthe gauge adjuster 9 andthe holdingplate 14. Then the head 16 of the'T-bolt is passed through the elongated holes 17 into the cavity 18 formed in the bed plate 3, the bolt Yis then rotated by a right angle to bring the head crete is very important from the ,l view to firmly set thebed plate in the body of 16 in close contact with the abutment 19'so as to hold the bolt at a iXed angular position with respect to the bed plate.V The gaugeof i the rails is properly adjusted by a suitable setting of the eccentric polygonal pieces 9, and finally the bolts are tightened by means of thenuts20. 't' Y If desired, the hollow space`4 ofthe bed plate-can be filled with concrete leaving la clearance space 21 underneath the floor plate 6. The filling of the hollow space4 by conpoint of the concrete sleeper. The hollow space 4 communicates'with the outside, that is, the bed plate isformed with the hollow space'4 eX- tending transversely of the sleeper through all the breadth ofthe bed plate, so that' they concrete lled in the space 4 forms a solid integral body withthe concrete material constituting thesleeper itself. V-

v The portion of the concrete body between theshoulders 5, 5. of the bed plate, as indicated by the lines A-A and B-B in Fig. 2, is made of slightly lower level to allow free bending of theoor plate 6.

Accordingto theinvention, the resilient floor plate 6, being provided with'the open Y i A plate disposed on the said bed plate and over notches-7 for the bolts to pass through, is entirely free to bend between the shoulders '5 of lthe-bed plate 3 in response to every fluctuation of the load imposed thereon.' In this manner, shocks and vibrations are effectively absorbed by the resilient metallic plate'andfthe possibilities of breakage of the vconcrete bodyrare prevented Moreover, on

i ,account of thisfact, the bolts are free from 50theactionsfto'pull them outv fromVY the bed Ythe bed plate with "tions, as in railway tracks. In my device, so long as the'lbol'ts'do not get loosened very much, however, the-holding plate 14, o-n account ofthe fact thatits toes rest on two oppositely inclined footings, willbe held at its initially set position,land will keep the .bolts v8inV an Vupright position. Owing to this fact land also on' account of the factthat thegauge adjusters reston the inclinedshoulder of the rail flange, V'they will firmly be pinched between the inclined shoulders of the rail flange Vnecessaryto embed the bed plate 3 in the concrete body in a correspondingly inclined manner.

When it becomes desirable, after the completion'of track rails, to modify the setting of the rails in the above mentioned manner, this can be effected by inserting-suitable distance pieces between the shoulders Vvjof/'the bed plate and the floor plate 6. Y Y s Y Y The concrete body should preferably be provided witha suitable aperture22 to facilitate themounting of thesleeperand to=pre vent the creepage thereof.. j

If desired, the clearance space 21 provided Vunderneath thev lioor plate 6 can be completely filled up by.l concrete', whcreby'thefloor plate is rendered non-yieldable, making the sleepf ers adaptedffor street tramways.

QWhatI claim isz- Y ;1 1

1. In a railway sleeper made of concrete, la combination comprising a bedplate'formed with a hollow open upwardly and av resilient' Yfloor plate for seating af'rail thereon, which is disposed on the said bed plateand overthe said hollow so that it is resiliently yieldable tothe loadl placed on it.

f 2. 4'In a railway sleeper made of concrete,

a' combination comprising a bed plateformed with. a vhollow open upwardly, a resilient floor 'iioor plate, the said floor platebeing provided with an elongated aperture :for the boltto pass through. f. f Y

3.. In arailway` a combination comprising a bed plateformed `vwith a hollow open upwardly, a resilient floor plate providediwithanA elongated aperture for a clamping bolt to pass through and dis-Y 3 fposedV over the said hollow ofthe bedplate, and a holding'plate for holding the y rail upon the Hoor plate. Y

V4. In a railwaysleeper made of concrete, -a combination comprising a bed plate formed with a hollow open upwardly,a resilient floor plateprovided with an' elongated aperture for a clamping bolt to pass through anddisposed over the said hollow of the'bed plate, aholding plate for holding therail upon the floor lplateand a polygonal member provided around the said bolt and in contactwith the longitudinal edgeof the rail flange, the sides of the said polygonal member being of varying radial distances fromthebolt. J Y l sleeper made of concrete,

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the sides at varying radial distances provided around the said bolt, the said polygonal mem-` ber being adapted to Contact with the longii v tudinalsloping edge of the rail lange'at its inwardly sloping peripheral wall.

6. In a railway sleeper made of concrete, a combination comprising a bed plate formed with a hollow open upwardly, a resilient floor plate provided with an elongated aperture` for a clamping bolt to pass through and disposed over the said hollow of the bed plate, a

n o G holding plate for holding the rail upon the Y floor plate and a polygonal dise-like member having the sides at varying radial distances, provided around the said bolt, the said holding plate resting on one hand on aninclined upper surface of the rail flange and on the other hand on an oppositely inclined longitudinal edge formed on the said bed plate.

In testimony whereof, I affix my signature.

JINICHI KUMAMOTO. 

